Antifrosting window.



W. N. JOHNSON.

ANTIFROSTING WINDOW.

APPucATlou mm 11111.15, 1915.

WALTER N. JOHNSON, OF WILLIAMSPORT, PENNSYLVANIA.

ANTIFROSTING WINDOW.

Specification of Letters Patent.

Patented June 15, 1915.

`Application filed January 15, 1915. Serial No. 2,393.

T0 al? fr/lont it may concer/1:

Re it known that I, IVALTEI: JOHNSON, a citiycn of the llnited States,residing at Williamsport, in the county of Lycoming and State ofPennsylvania, have invented certain new and .is\ful Improvements inAntifrosting Tvlfindovvs; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make rind use thesame.

My invention relates to improvements in means for keeping the windows ofvehicles free from moisture. ice or similar deposits.

The primary obi/ect of my invention is to proride means to preventformation of frostor ice on windows, that will operate to dispel veryrapidly water, sleet or snow which may be driven against the window. the

means comprising a suitable heating element that is arranged to heat thepane of glass and in such manner as to not interfere with the opening orclosing of the window.

Another object is to improve anti-frosting means of the characterdescribed so as to render it more practical, simple as to construction,capable of being readily attached to windows of various characters andinexpensive to manufacture. Y

The above and additional objects are accomplished by such means as areillustrated in the accompanying drawings, described in the followingspecication and then more particularly pointed out in the claims.

lilith reference to the drawings, wherein I have illustrated thepreferred embodiment of my invention as it is reduced to practice, andthroughout the several views of which similar reference numeralsdesignate corresponding parts, Figure 1 is a front elevation of a windowconstructed in accordance with my invention showing it broken away toshow the position of the heating element and a portion of the windowframe, F ig. 2 is a fragmentary vertical sectional view taken on line 22 of Fig. 1, and Fig. 3 is a fragmentary vertical sectional View takenon line 3 3 or Fig. 1.

Referring to the drawings by characters of reference, A designates aWindow of the type usually found on street cars at the ends thereof, andB the frame therefor. The window A comprises a glass pane 1 which ismounted in the usual side bars 2 and top and bottom bars 3 and 4. Thebars, 2, 3, and 4: are channel-shaped to receive the glass pane 1.Mounted within the channel-shaped bars. Q, and t are asbestos or othernonheat conducting strips 5 that communicate with one another and areeach U-shape in cross section. The strips 5 receive the edges of theglass pane 1 which edges are spaced from the outer edges of the strips.

)'Iounted within the U-shaped strips 5 and disposed in engagement withthe edges of the pane 1 is a coiled electrical heating ele ment G.Conductors 7 and S are connected with the ends of this heating elementand with contact plates 9 and 10 carried upon the outer face of one ofthe side bars 2 of the window. rFliese contact plates 9 and 10 arespaced from one another and arranged for coperation with similar plates11. The plates 11 are carried upon the frame B for the window and are soarranged as to engage -the plates 9 and 10 when the window A is in upposition. Conductors 12 and 13 lead from the plates 11 to a battery 14or other suitable source of current. A one pole switch 15 is connectedin the conductor lland may be arranged at any suitable point upon thevehicle carrying the window.

In use, the heating element 6 transmits vheat to the glass pane 1 as itengages the edges of the pane and all water, sleet, or snow drivenagainst the pane or that which may have accumulated. thereon will bereadily dispelled by being melted. The asbestos strips 5 prevent thebars 2, 3, and 4 which may be preferably constructed of wood frombecoming injured by the heating element.

With reference to the foregoing description it will be seen that I haveprovided an anti-frosting window attachment that may be attached towindows of various characters without necessitating any material changein the construction thereof, and which when attached will not be in theway so as to prevent operation of the window in the ordinary manner.

My improved heating device is entirely hidden from view and is arrangedso that little or no space is taken up. It will be seen that the windowwill provide for the Closing of the circuit for the heating element, inup position, if the one pole switch 15 is closed. In providing theswitch 15, however, the heating element may be put into operation at anydesired time.

InV practice, I have found that the form of my invention, illustrated inthe drawings and referred to in the above description, as

gpg 1,14

the preferred embodiment, is the most etlicient and practical; yetrealizing that the conditions concurrent with the adoption o' my devicewill necessarily Vary, l desire to emphasize the Atact that variousminor changes in details of construction, proportion and arrangement ofparts may be resorted to, when required, Without sacrificing any ot' theadvantages of my invention, as claimed.

What is 'claimed is 1. rlhc combination with a sash frame including sidebars, and top and bottom bars of a glass pane mounted Within Said barsand heating elements mounted Within the bars and interposed between thepane and said barso 2. rEhe 4combination with a Window including a trameconsisting of a number of channel shaped bars, or a glass pane mountedWithin said bars, and a heating element mounted Within and extending thelength of said bars, said heating element engaging the outer edges ofthe glass pane.

3. T he combination with a Window including a frame consisting of anumber of channel shaped bars of a glass pane mounted within said bars7a heating element mounted within and extending the length of said bars,

said heating element engaging the outer

